/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/

let promise = new Promise((resolve, reject) => {   
    setTimeout(() => {
        resolve('hello');
    }, 10)
})

promise.then(value => {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            resolve(value + 'lagou');
        }, 10)
    }) 
}).then(value => {
    setTimeout(() => {  
        console.log(value + 'I ♥ U');
    }, 10)
})
